Signal extension method and system

ABSTRACT

A signal extension system is provided according to the present disclosure, which includes: a transmitting side chip and a receiving side chip connected to the transmitting side chip. The transmitting side chip is configured to receive high-definition video data and transmit the high-definition video data to the receiving side chip after performing first color space conversion, low compression, parallel-serial coding on the high-definition video data sequentially. The receiving side chip is configured to receive the high-definition video data transmitted from the transmitting side chip and output the high-definition video data to a display device for display after performing serial-parallel decoding, low decompression, and second color space conversion on the received high-definition video data. With the above signal extension system, a transmission distance of the high-definition video data is extended.

CROSS REFERENCE TO RELATED APPLICATION

The present application claims priority under 35 U.S.C. § 119 to ChinesePatent Application No. 201710607011.X, filed on Jul. 24, 2017, ChinesePatent Application No. 201720903746.2, filed on Jul. 24, 2017, andTaiwan Patent Application No. 106140889, filed on Nov. 24, 2017, theentire content of which is incorporated herein by reference.

FIELD

The present disclosure relates to the technical field of signaltransmission, and in particular to a signal extension method and asignal extension system.

BACKGROUND

Technologies of high-definition media interface (HDMI) or highdefinition displayport (DP) has advantages of non-compression losslesshigh resolution display characteristics and real-time performance tobring high quality audio-visual experience to users. A HDMI or DP basedkeyboard, video, mouse (KVM) system is a common comprehensive systemthat provides users with controllable high-definition video displayservices.

The high-definition images without compression require a high data rate,which limits the application of this technology. Since a high-definitionsignal is attenuated exponentially in a cable, a high-definition HDMI orDP signal, especially a high-definition 4k or 8k signal, can only betransmitted a few meters away even with an expensive wire, thus greatlylimiting applications of non-compression lossless high-definitiondisplay based on the HDMI or DP.

Due to the limitation of transmission distance of high-definition data,a KVM system can only provide the high-definition video display servicesin a small range. Therefore, an effective signal extension circuitsystem is required to extend a transmission distance of ahigh-definition signal.

SUMMARY

Due to the defects of the conventional technology, a signal extensionmethod and a signal extension system are provided according to thepresent disclosure, which can extend a transmission distance of ahigh-definition signal.

A signal extension system includes: a transmitting side chip and areceiving side chip connected to the transmitting side chip. Thetransmitting side chip is configured to receive high-definition videodata and transmit the high-definition video data to the receiving sidechip after performing first color space conversion, low compression,parallel-serial coding on the high-definition video data sequentially.The receiving side chip is configured to receive the high-definitionvideo data transmitted from the transmitting side chip and output thehigh-definition video data to a display device for display afterperforming serial-parallel decoding, low decompression, second colorspace conversion on the received high-definition video data.

The transmitting side chip includes: a data receiving module, a protocollogic module, a first color space conversion module, a low compressionmodule, a universal serializer and deserializer (SERDES) codingparallel/serial conversion module and a data transmitting module. Thedata receiving module is configured to receive a high-definition videodata packet. The protocol logic module is connected to the datareceiving module, and configured to perform protocol unpacking on thehigh-definition video data packet received by the data receiving moduleto obtain the high-definition video data. The first color spaceconversion module is connected to the protocol logic module, andconfigured to perform the first color space conversion on thehigh-definition video data transmitted from the protocol logic module.The low compression module is connected to the first color spaceconversion module, and configured to perform the low compression onhigh-definition video data subjected to the first color space conversionand transmitted from the first color space conversion module. Theuniversal SERDES coding and parallel-serial conversion module isconnected to the low compression module, and configured to performcoding and parallel-serial conversion on the compressed high-definitionvideo data transmitted from the low compression module. The datatransmitting module is connected to the universal SERDES coding andparallel-serial conversion module, and configured to transmit serialhigh-definition video data transmitted from the universal SERDES codingand parallel-serial conversion module to the receiving side chip.

The receiving side chip includes: a signal receiving module, a universalSERDES decoding and serial-parallel conversion module, a datadecompression module, a second color conversion module, a protocolpacking module and a signal transmitting module. The signal receivingmodule is configured to receive the high-definition video datatransmitted from the transmitting side chip. The universal SERDESdecoding and serial-parallel conversion module is connected to thesignal receiving module, and configured to perform decoding andserial-parallel conversion on the high-definition video data received bythe signal receiving module. The data decompression module is connectedto the universal SERDES decoding and serial-parallel conversion module,and configured to perform decompression on the high-definition videodata transmitted from the universal SERDES decoding and serial-parallelconversion module. The second color space conversion module is connectedto the data decompression module, and configured to perform the secondcolor space conversion on the high-definition video data transmittedfrom the data decompression module. The protocol packing module isconnected to the second color space conversion module, and configured toperform protocol packing on the high-definition video data subjected tothe second color space conversion and transmitted from the second colorspace conversion module to obtain a high-definition video data packet.The signal transmitting module is connected to the protocol packingmodule, and configured to transmit the high-definition video data packettransmitted from the protocol packing module to the display device fordisplay.

The system further includes: two bidirectional universal serial bus(USB) signal extension chips connected to each other, configured totransmit a USB signal and a control signal.

The two bidirectional USB signal extension chips are connected to eachother via a pair of differential lines.

The transmitting side chip and the receiving side chip are connected viaa pair of differential lines.

The transmitting side chip and the receiving side chip are connected viathree or less pairs of differential lines.

The transmitting side chip is an application specific integrated circuit(ASIC) chip or a field programmable gate array (FPGA) chip; and thereceiving side chip is an ASIC chip or an FPGA chip.

A signal extension method applied to a data transmitting side includesfollowing steps. High-definition video data is received. First colorspace conversion, low compression, coding and parallel-serial conversionare performed on the high-definition video data sequentially. Theprocessed high-definition video data is transmitted to a data receivingside, so that the data receiving side processes the high-definitionvideo data and transmits the high-definition video data to a displaydevice for display.

The method further includes: receiving a control signal and transmittingthe control signal to the data receiving side.

A signal extension method applied to the data receiving side, includesfollowing steps. High-definition video data transmitted from a datatransmitting side is received, where the high-definition video data ishigh-definition video data subjected to first color space conversion,low compression, coding and parallel-serial conversion performed by thedata transmitting side. Decoding, serial-parallel conversion,decompression and second color space conversion are performed on thehigh-definition video data sequentially. The processed high-definitionvideo data is transmitted to a display device, so that the displaydevice displays the high-definition video data.

The method further includes following steps. A control signaltransmitted from the data transmitting side is received and the controlsignal is transmitted to the display device, so that the display devicecontrols a display process of the high-definition video data based onthe control signal.

The signal extension system provided according to the present disclosuremainly includes two receiving/transmitting chips connected to eachother. A chip is used for transmitting a high-definition video datasignal to another chip after performing the first color spaceconversion, low compression and parallel-serial coding on thehigh-definition video data. The other chip outputs the high-definitionvideo data signal to a display device for display after receiving thehigh-definition video data signal and performing the serial-paralleldecoding, low decompression, second color space conversion on thehigh-definition video data. The above first color space conversion andthe low compression may reduce a data bandwidth without affecting videoimage quality, thereby extending a transmission distance of thehigh-definition video data.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate technical solutions of theembodiments of the present disclosure or the conventional technology,the drawings required in the description of the embodiments or theconventional technology are briefly described below. Apparently, thedrawings show only some embodiments of the present disclosure, and otherdrawings may be acquired by those skilled in the art based on thedrawings provided herein without any creative work.

FIG. 1 is a schematic structural diagram of a signal extension systemaccording to an embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of a signal extension systemaccording to another embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of a signal extension systemaccording to another embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of a signal extension systemaccording to another embodiment of the present disclosure;

FIG. 5 is a schematic flowchart of a signal extension method accordingto an embodiment of the present disclosure; and

FIG. 6 is a schematic flowchart of a signal extension method accordingto another embodiment of the present disclosure

DETAILED DESCRIPTION

The technical solutions according to the embodiments of the presentdisclosure will be described clearly and completely hereinafter inconjunction with the drawings in the embodiments of the presentdisclosure. Apparently, the described embodiments are only a part ratherthan all of embodiments of the present disclosure. Any other embodimentsacquired by those skilled in the art based on the embodiments of thepresent disclosure without any creative work fall in the protectionscope of the present disclosure.

A signal extension system is provided in the embodiment of the presentdisclosure. As shown in FIG. 1, the system includes: a transmitting sidechip 101 and a receiving side chip 102 connected to the transmittingside chip 101.

The transmitting side chip 101 and the receiving side chip 102 aremainly used for processing signals and transmitting or receivingsignals. The transmitting side chip 101 and the receiving side chip 102are arranged on different positions, and are connected by a dataconnection line for signal transmission.

The transmitting side chip 101 is configured to receive high-definitionvideo data and transmit the high-definition video data to the receivingside chip 102 after performing first color space conversion, lowcompression and parallel-serial coding on the high-definition video datasequentially.

In the embodiment, the high-definition video data received by thetransmitting side chip 101 is a high-definition video data packetreceived through a HDMI port or a DP port. A protocol parsing process isperformed on the high-definition video data packet to obtain thehigh-definition video data.

The first color space conversion may reduce a color depth of thehigh-definition video data so as to reduce a data rate of thehigh-definition video data. The low compression may achieve a codestream compression ratio up to 8:1 without affecting image quality,thereby reducing a bandwidth required for code stream transmission.

The parallel-serial coding refers to a process of coding thehigh-definition video data and performing parallel-serial conversion toconvert parallel data into serial data.

Finally, the transmitting side chip 101 transmits the processed serialhigh-definition video data to the receiving side chip 102.

The receiving side chip 102 is configured to receive the high-definitionvideo data transmitted from the transmitting side chip 101 and outputthe high-definition video data to a display device for display afterperforming serial-parallel decoding, low decompression and second colorspace conversion on the received high-definition video datasequentially.

The transmitting side and the receiving side of the signal extensionsystem are in a symmetrical architecture. That is, the structure of thereceiving side chip 102 is symmetrical to the structure of thetransmitting side chip 101. Corresponding to the transmitting side chip101 performing the first color space conversion, low compression, codingand parallel-serial conversion, the receiving side chip 102 performs theserial-parallel conversion, decoding, decompression and second colorspace conversion on the high-definition video data transmitted from thetransmitting side chip 101 to convert the color space of thehigh-definition video data to an original color space, thereby achievinga recovery of the received high-definition video data.

Finally, the receiving side chip 102 outputs recovered high-definitionvideo data to the display device for display. The high-definition videodata recovered by the receiving side chip 102 is the same as thehigh-definition video data received by the transmitting side chip 101.

The signal extension system provided in the embodiment of the presentdisclosure mainly includes two receiving/transmitting chips connected toeach other. A chip is used for transmitting high-definition video datato the other chip after performing the first color space conversion, lowcompression and parallel-serial coding on the high-definition videodata. The other chip outputs the high-definition video data signal to adisplay device for display after receiving the high-definition videodata signal and performing the serial-parallel decoding, lowdecompression, second color space conversion on the high-definitionvideo data. The first color space conversion and the low compression mayreduce a data bandwidth without affecting video image quality, therebyextending a transmission distance of the high-definition video data.

In another embodiment of the present disclosure, as shown in FIG. 2, thetransmitting side chip 101 includes: a data receiving module 1011, aprotocol logic module 1012, a first color space conversion module 1013,a low compression module 1014, a universal SERDES coding andparallel-serial conversion module 1015 and a data transmitting module1016.

The data receiving module 1011 is configured to receive ahigh-definition video data packet.

In an embodiment, the data receiving module 1011 includes a datareceiving circuit connected to a HDMI port or a DP port to receive thehigh-definition video data packet outputted from the HDMI port or the DPport.

The protocol logic module 1012 is connected to the data receiving module1011 and is configured to perform protocol unpacking on thehigh-definition video data packet received by the data receiving module1011 to obtain the high-definition video data.

After receiving the high-definition video data packet, the datareceiving module 1011 transmits the high-definition video data packet tothe protocol logic module 1012. The protocol logic module 1012 unpackingthe received high-definition video data packet according to a specifiedprotocol, to obtain the high-definition video data included in the datapacket.

The first color space conversion module 1013 is connected to theprotocol logic module 1012 and is configured to perform the first colorspace conversion on the high-definition video data transmitted by theprotocol logic module 1012.

The protocol logic module 1012 transmits the unpacked high-definitionvideo data to the first color space conversion module 1013. The firstcolor space conversion module 1013 performs conversion on a color spaceof the high-definition video data. In implementing the technical schemeof the present disclosure, an engineer may determine whether a colorspace conversion of 4:4:4→4:2:2 or 4:4:4→4:2:0 is to be adopted based ona resolution requirement, a wire quality and a wire length of thedisplay device and a signal format supported by the signal source of thetransmitting side. The color depth of the high-definition video data canbe reduced by the color space conversion, thereby reducing the databandwidth.

It should be noted that, based on an actual use demand, the first colorspace conversion may not be performed on the high-definition video data.In this case, the first color space conversion module 1013 may beremoved from the transmitting side chip 101 or may be controlled not towork.

The low compression module 1014 is connected to the first color spaceconversion module 1013 and is configured to perform low compression onthe high-definition video data subjected to the first color spaceconversion and transmitted from the first color space conversion module1013.

The first color space conversion module 1013 transmits thehigh-definition video data to the low compression module 1014 afterperforming the first color space conversion on the high-definition videodata. The low compression module 1014 performs low compression on thehigh-definition video data. In practices, based on a data transmissiondemand, a compression ratio may be set as 1, 2, 3 or 4, to furtherreduce the bandwidth of a video code stream while ensuring a high imagequality.

It should be noted that, based on actual demands on data transmissionrate and distance, the step of compressing the high-definition videodata may be omitted, that is, the low compression module 1014 may beomitted.

The universal SERDES coding and parallel-serial conversion module 1015is connected to the low compression module 1014 and is configured toperform coding and parallel-serial conversion on compressedhigh-definition video data transmitted from the low compression module1014.

The low compression module 1014 transmits the low compressedhigh-definition video data to the universal SERDES coding andparallel-serial conversion module 1015. The universal SERDES coding andparallel-serial conversion module 1015 performs the coding and theparallel-serial conversion on the low compressed high-definition videodata to convert the high-definition video data to coded serial data.

The data transmitting module 1016 is connected to the universal SERDEScoding and parallel-serial conversion module 1015 and is configured totransmit the serial high-definition video data transmitted from theuniversal SERDES coding and parallel-serial conversion module to thereceiving side chip 102.

The universal SERDES coding and parallel-serial conversion module 1015transmits the serial high-definition video data to the data transmittingmodule 1016, so that the data transmitting module 1016 transmits theserial high-definition video data to the receiving side chip 102.

In another embodiment of the present disclosure, as shown in FIG. 3, thereceiving side chip 102 includes: a signal receiving module 1021, auniversal SERDES decoding and serial-parallel conversion module 1022, adata decompression module 1023, a second color space conversion module1024, a protocol packing module 1025 and a signal transmitting module1026.

The signal receiving module 1021 is configured to receive thehigh-definition video data transmitted from the transmitting side chip101.

The universal SERDES decoding and serial-parallel conversion module 1022is connected to the signal receiving module 1021 and is configured toperform decoding and serial-parallel conversion on the high-definitionvideo data received by the signal receiving module 1021.

The data decompression module 1023 is connected to the universal SERDESdecoding and serial-parallel conversion module 1022 and is configured toperform decompression on the high-definition video data transmitted fromthe universal SERDES decoding and serial-parallel conversion module1022.

The second color space conversion module 1024 is connected to the datadecompression module 1023 and is configured to perform the second colorspace conversion on the high-definition video data transmitted from thedata decompression module 1023.

The protocol packing module 1025 is connected to the second color spaceconversion module 1024 and is configured to perform protocol packing onthe high-definition video data subjected to the second color spaceconversion and transmitted from the second color space conversion module1024 to obtain the high-definition video data packet.

The signal transmitting module 1026 is connected to the protocol packingmodule 1025 and is configured to transmit the high-definition video datapacket transmitted from the protocol packing module 1025 to a displaydevice for display.

The structure of the receiving side chip 102 is symmetrical to thestructure of the transmitting side chip 101. Processes performed in thesignal receiving module 1021, the universal SERDES decoding andserial-parallel conversion module 1022, the data decompression module1023, the second color space conversion module 1024, the protocolpacking module 1025 and the signal transmitting module 1026 in thereceiving side chip 102 respectively corresponds to the processes of themodules in the transmitting side chip 101.

It should be noted that, a decompression ratio of the decompressionperformed by the data decompression module 1023 and a mechanism of thecolor space conversion performed by the second color space conversionmodule 1024 in the receiving side chip 102 should be respectively thesame as the compression ratio of the low compression and the mechanismof the first color space conversion performed in the transmitting sidechip, such that the receiving side chip 102 can correctly recover thehigh-definition video data.

In another embodiment of the present disclosure, as shown in FIG. 4, thesystem further includes: two bidirectional USB signal extension chips103 connected to each other and configured to transmit a control signal.

The above bidirectional USB signal extension chip 103 is an improvedbidirectional USB2.0 extender ASIC chip, specifically used for extendinga USB signal and other control signals such as a specially processedDDC/AUX signal.

In a KVM system, the display device is controlled by a keyboard and amouse to display the video. Therefore, in the embodiment of the presentdisclosure, a pair of bidirectional USB signal extension chips 103 isused for achieving extended transmission of the control signal. In thisway, display of high-definition video can be controlled in the KVMsystem.

In another embodiment of the present disclosure, the two bidirectionalUSB signal extension chips 103 are connected to each other via a pair ofdifferential lines.

The pair of differential lines, which connect the two bidirectional USBsignal extension chips to each other, may be an ordinary CAT cable, suchas a CAT5e cable and a CAT6 cable.

In another embodiment of the present disclosure, the transmitting sidechip 101 and the receiving side chip 102 are connected to each other viaa pair of differential lines.

The pair of differential lines, which connect the transmitting side chip101 and the receiving side chip 102 to each other, may be an ordinaryCAT cable, such as a CAT5e cable and a CAT6 cable.

In another embodiment of the present disclosure, the transmitting sidechip 101 and the receiving side chip 102 are connected to each other viathree or less pairs of differential lines.

In the embodiment of the present disclosure, the three pair ofdifferential lines, which connect the transmitting side chip 101 and thereceiving side chip 102 to each other, may be three or less pairs ofdifferential lines in a CAT cable. In this way, another pair ofdifferential lines in the CAT cable may be used for transmitting acontrol signal. Therefore, only one CAT cable is required to constructthe KVM system with the signal extension system according to theembodiment, which is quite convenient.

In another embodiment of the present disclosure, the transmitting sidechip 101 or the receiving side chip 102 may be an application specificIntegrated circuit (ASIC) chip, or a field programmable gate array(FPGA) chip.

A signal extension method is provided according to an embodiment of thepresent disclosure, which is applied to a data transmitting side. Asshown in FIG. 5, the method includes step S501 to S503.

In step S501, high-definition video data is received.

The data transmitting side receives a high-definition video data packetfrom a HDMI port or a DP port and performs protocol parsing on thehigh-definition video data packet, to obtain the high-definition videodata.

In step S502, first color space conversion, low compression, coding andparallel-serial conversion are performed on the high-definition videodata sequentially.

In implementing the technical scheme of the present disclosure, anengineer may determine whether a color space conversion of 4:4:4→4:2:2or 4:4:4→4:2:0 is to be adopted based on a resolution requirement, awire quality and a wire length of the display device and a signal formatsupported by the signal source of the transmitting side. The color depthof the high-definition video data can be reduced by the first colorspace conversion, thereby reducing the data bandwidth.

In practices, when performing the low compression on the high-definitionvideo data, based on a data transmission demand, a compression ratio maybe set as 1, 2, 3 or 4, to further reduce the bandwidth of the videocode stream while ensuring a high image quality.

It should be noted that, when implementing the technical scheme of theembodiment of the present disclosure, whether to perform the first colorspace conversion and the low compression on the high-definition videodata can be determined based on the data transmission demand.

After performing the first color space conversion and the lowcompression on the high-definition video data, the coding and theparallel-serial conversion are performed to convert the high-definitionvideo data to coded serial data.

In step S503, the processed high-definition video data is transmitted tothe data receiving side, so that the data receiving side processes thehigh-definition video data and transmits the high-definition video datato the display device for display.

In an embodiment, the data transmitting side transmits thehigh-definition video data processed by step S502 to the data receivingside through three or less pairs of differential lines. The above threeor less pairs of differential lines may be three or less pairs ofdifferential lines in a CAT cable.

With the signal extension method provided in the embodiment of thepresent disclosure, the first color space conversion and the lowcompression are performed on the high-definition video data at the datatransmitting side to reduce the bandwidth of high-definition video datawhile ensuring the image quality. Then the processed high-definitionvideo data is recovered at the data receiving side to obtain originalhigh-definition video data. In this way, a transmission distance of thehigh-definition video data is extended.

In another embodiment of the present disclosure, the method furtherincludes a step of receiving a control signal and transmitting thecontrol signal to the data receiving side.

In the embodiment of the present disclosure, transmission of the controlsignal is also achieved. The transmission process of the control signalis similar to the transmission process of the high-definition videodata. The USB signal extension chip of the data transmitting sidereceives the control signal and transmits the control signal to the USBsignal extension chip of the data receiving side through a pair ofdifferential lines to achieve the extended transmission of the controlsignal.

Another signal extension method is provided in the embodiment of thepresent disclosure, which is applied to the data receiving side. Asshown in FIG. 6, the method includes the following steps S601 to S603.

In step S601, high-definition video data transmitted from the datatransmitting side is received, where the high-definition video data ishigh-definition video data subjected to the first color spaceconversion, low compression, coding and parallel-serial conversionperformed by the data transmitting side.

In the embodiment of the present disclosure, the data transmitting sidefirstly receives the high-definition video data then performs the firstcolor space conversion, the low compression, the coding and theparallel-serial conversion on the high-definition video data.

An engineer may determine whether a color space conversion of4:4:4→4:2:2 or 4:4:4→4:2:0 is to be adopted based on a resolutionrequirement, a wire quality and a wire length of the display device anda signal format supported by the signal source of the transmitting side.The color depth of the high-definition video data can be reduced by thecolor space conversion, thereby reducing the data bandwidth.

In practices, for performing the low compression on the high-definitionvideo data, based on the data transmission demand, the compression ratiomay be set as 1, 2, 3 or 4, to further reduce the bandwidth of videocode stream while ensuring a high image quality.

After performing the first color space conversion and the lowcompression on the high-definition video data, the coding and theparallel-serial conversion are performed to convert the high-definitionvideo data to coded serial data.

Finally, the data transmitting side transmits processed high-definitionvideo data to the data receiving side.

In step S602, decoding, serial-parallel conversion, decompression andsecond color space conversion are performed on the high-definition videodata sequentially.

After receiving the processed high-definition video data transmittedfrom the data transmitting side, the data receiving side performs thedecoding, serial-parallel conversion, decompression and second colorspace conversion on the high-definition video data sequentially torecover the high-definition video data to original high-definition videodata.

In step S603, the processed high-definition video data is transmitted tothe display device, so that the display device displays thehigh-definition video data.

The data receiving side packs the recovered high-definition video datainto a high-definition video data packet and transmits it to the displaydevice, so that the display device displays a high-definition video inthe high-definition video data packet.

With the signal extension method provided in the embodiment of thepresent disclosure, the first color space conversion and the lowcompression are performed on the high-definition video data at the datatransmitting side to reduce the bandwidth of the high-definition videodata while ensuring the image quality. Then the processedhigh-definition video data is recovered at the data receiving side toobtain the original high-definition video data. In this way, atransmission distance of the high-definition video data is extended.

In another embodiment of the present disclosure, the method furtherincludes a step of receiving a control signal transmitted from the datatransmitting side and transmitting the control signal to the displaydevice, so that the display device controls a display process of thehigh-definition video data based on the control signal.

In the embodiment of the present disclosure, transmission of the controlsignal is also achieved. The transmission process of the control signalis similar to the transmission process of the high-definition videodata. The USB signal extension chip of the data transmitting sidereceives the control signal and transmits the control signal to the USBsignal extension chip of the data receiving side through a pair ofdifferential lines to achieve the extended transmission of the controlsignal.

With reference to the description of the embodiments herein, thoseskilled in the art can implement or use the technical solution in thepresent disclosure. Numerous modifications to the embodiments areapparent to those skilled in the art, and the general principles definedherein can be implemented in other embodiments without deviating fromthe spirit or scope of the present disclosure. Therefore, the scope ofthe present disclosure is not limited to the embodiments describedherein, but is in accordance with the widest scope consistent with theprinciples and novel features disclosed herein.

The invention claimed is:
 1. A signal extension system, comprising: atransmitting side chip, a receiving side chip connected to thetransmitting side chip, and two bidirectional universal serial bus (USB)signal extension chips connected to each other, configured to transmit aUSB signal and a control signal; wherein the control signal comprises aDDC signal and/or an AUX signal; the transmitting side chip isconfigured to receive high-definition video data and transmit thehigh-definition video data to the receiving side chip after performingfirst color space conversion, low compression, parallel-serial coding onthe high-definition video data sequentially; and the receiving side chipis configured to receive the high-definition video data transmitted fromthe transmitting side chip and output the high-definition video data toa display device for display after performing serial-parallel decoding,low decompression, second color space conversion on the receivedhigh-definition video data.
 2. The system according to claim 1, whereinthe transmitting side chip comprises: a data receiving module,configured to receive a high-definition video data packet; a protocollogic module connected to the data receiving module, configured toperform protocol unpacking on the high-definition video data packetreceived by the data receiving module to obtain the high-definitionvideo data; a first color space conversion module connected to theprotocol logic module, configured to perform the first color spaceconversion on the high-definition video data transmitted from theprotocol logic module; a low compression module connected to the firstcolor space conversion module, configured to perform the low compressionon the high-definition video data subjected to the first color spaceconversion and transmitted from the first color space conversion module;a universal serializer and deserializer (SERDES) coding andparallel-serial conversion module connected to the low compressionmodule, configured to perform coding and parallel-serial conversion onthe compressed high-definition video data transmitted from the lowcompression module; and a data transmitting module connected to theuniversal SERDES coding and parallel-serial conversion module,configured to transmit serial high-definition video data transmittedfrom the universal SERDES coding and parallel-serial conversion moduleto the receiving side chip.
 3. The system according to claim 1, whereinthe receiving side chip comprises: a signal receiving module, configuredto receive the high-definition video data transmitted from thetransmitting side chip; a universal serializer and deserializer (SERDES)decoding and serial-parallel conversion module connected to the signalreceiving module, configured to perform decoding and serial-parallelconversion on the high-definition video data received by the signalreceiving module; a data decompression module connected to the universalSERDES decoding and serial-parallel conversion module, configured toperform the low decompression on the high-definition video datatransmitted from the universal SERDES decoding and serial-parallelconversion module; a second color space conversion module connected tothe data decompression module, configured to perform the second colorspace conversion on the high-definition video data transmitted from thedata decompression module; a protocol packing module connected to thesecond color space conversion module, configured to perform protocolpacking on the high-definition video data subjected to the second colorspace conversion and transmitted from the second color space conversionmodule to obtain a high-definition video data packet; and a signaltransmitting module connected to the protocol packing module, configuredto transmit the high-definition video data packet transmitted from theprotocol packing module to the display device for display.
 4. The systemaccording to claim 1, wherein the two bidirectional USB signal extensionchips are connected to each other via a pair of differential lines. 5.The system according to claim 1, wherein the transmitting side chip andthe receiving side chip are connected via a pair of differential lines.6. The system according to claim 5, wherein the transmitting side chipand the receiving side chip are connected via three or less pairs ofdifferential lines.
 7. The system according to claim 1, wherein thetransmitting side chip is an application specific integrated circuit(ASIC) chip or a field programmable gate array (FPGA) chip; and thereceiving side chip is an ASIC chip or an FPGA chip.
 8. A signalextension method applied to a data transmitting side, comprising:receiving high-definition video data; performing first color spaceconversion, low compression, coding and parallel-serial conversion onthe high-definition video data sequentially; transmitting the processedhigh-definition video data to a data receiving side, wherein the datareceiving side processes the high-definition video data and transmitsthe high-definition video data to a display device for display; andreceiving a control signal and transmitting the control signal, by afirst bidirectional USB signal extension chip on the data transmittingside, to a second bidirectional USB signal extension chip on the datareceiving side, wherein the first bidirectional USB signal extensionchip and the second bidirectional USB signal extension chip areconnected with each other, and the control signal comprises DDC signaland/or AUX signal.
 9. A signal extension method applied to a datareceiving side, comprising: receiving high-definition video datatransmitted from a data transmitting side, wherein the high-definitionvideo data is high-definition video data subjected to first color spaceconversion, low compression, coding and parallel-serial conversionperformed by the data transmitting side; performing decoding,serial-parallel conversion, decompression and second color spaceconversion on the high-definition video data sequentially; transmittingthe processed high-definition video data to a display device, whereinthe display device displays the high-definition video data; receiving acontrol signal by a second bidirectional USB signal extension chip; andtransmitting the control signal to the display device, wherein thedisplay device controls a display process of the high-definition videodata based on the control signal, wherein the control signal istransmitted from the data transmitting side by a first bidirectional USBsignal extension chip, the first bidirectional USB signal extension chipand the second bidirectional USB signal extension chip are connectedwith each other, and the control signal comprises DDC signal and/or AUXsignal.